So here is my findings. Maybe someone can give me a hint
Applying any styleSheet on Android shifts Z-order of QMessageBox which makes its buttons unclickable

Here what is going on:

//setting styleSheet to any widget breaks interactivity on Android setStyleSheet("QPushButton { }"); QMessageBox::information(this,"Check the message", "Is it clickable?" ); //it is not clickable on Android

But if we manually set Z-order to the message this message becomes clickable. But further ones ARE NOT

setStyleSheet("QPushButton { }"); //applying styleSheet QMessageBox msgBox; msgBox.setText("StyleSheet is set. Z-order fixed"); //set stayOnTop flag and it becomes clickable msgBox.setWindowFlags(Qt::Dialog | Qt::WindowStaysOnTopHint); msgBox.exec(); //Next message is unclickable QMessageBox::information(this,"Check next message", "Is it clickable?" ); //No it is not clickable

How to restore correct Z-order for all of my windows and messages after apllying a styleSheet in Android?